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Fluorite 








Fluorite: Calcium Fluoride 
(copyright theimage.com)




Fluorite CaF2



Fluorite is usually colourless if pure but with impurities its colour can range from blue, pink,
 purple, green and yellow. Its lustre is generally vitreous. Crystals are cubic, octahedral or
 dodecahedral with a cleavage parallel to the octahedral. Hardness is 4. Fluorite occurs as a gangue mineral in medium to high temperature hydrothermal veins associated with lead, zinc and silver sulphides. It can also occur in pegmatites and as an accessory mineral in the cavities of felsic
 intrusives. World class deposits can be found in Canada (Ontario), USA (Kentucky), England (Derbyshire: Blue John Caves) and Mexico.



Uses: Fluorite is used in the production of hydrofluoric acid which is used in the pottery, optical
 and plastics industries. Very pure crystals can be used in spectrographic prisms.








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